Effects of ZnO Modification on the Electrochemical Performance of Fe1.5P

ZnO-modified Fe_(1.5)P powders were synthesized successfully via a rheological phase method.X-ray diffractometry (XRD) was utilized to analyze the composition.TEM was used to characterize the morphology.The effects of ZnO modification on the electrochemical performance of the Fe_(1.5)P were investigated using constant current charge/discharge method,cyclic voltammogram,and electrochemical impedance spectrograph(EIS).The experimental results show that ZnO modification can enhance the rate performance of Fe_(1.5)P.The first discharge capacity of the ZnO-modified Fe_(1.5)P is 837.5mAh/g,and 69.7%higher than that of the pristine Fe_(1.5)P.After 215 cycles, the discharge capacity of the Fe_(1.5)P at 12C rate is increased to 144.3%.Furthermore,ZnO modification improve 330%of the recovery discharge capability of the Fe_(1.5)P at 0.1 C rate.In addition,in comparison with the pristine Fe_(1.5)P,ZnO modification reduce 87.9%of the SEI film resistance R_(SEI),87%of the charge transfer resistance R_d,and 13.2%of the Warburg impedance W_b from the diffusion of lithium ions,while can improve 86.6%of the diffusion efficiency of lithium ions.